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Engineering notes from 9io.
How we build products, AI systems and trading infrastructure — and what we learn on the way. Written by the people who do the work, with the sources linked.
AI industry
Migrating MCP servers and clients to the stateless 2026-07-28 spec
MCP’s 2026-07-28 revision drops sessions and the initialize handshake. What breaks, which clients support it in October 2026, and how to migrate safely.
6 October 2026 · 13 min read MCPMaking one MCP server work in Claude, ChatGPT, Cursor and VS Code
What broke when one remote MCP server met Claude, ChatGPT, Cursor, VS Code and command-line clients, and the OAuth and version fixes behind each.
26 September 2026 · 13 min read